Thomas hollidat



IIITE STATES PATENT OFFICE.

THOMAS HOLLIDAY, OF HUDDERSFIELD, COUNTY OF YOIIK, ENGLAND.

PRODUCTION OF AZO COLORS ON COITON FABRICS.

SZZCIFICATION forming pert of Letters Patent No. 271,636, dated February6, 1883.

Application filed August 22, 1882. (No specimens.)

To all whom ti may concern Be it known that I, THoMAs HQLLIDAY, ofHuddersfield, county of York, England, have invented a new and usefulImprovement in Coloring-Matters, of which the following is a full, true,and exact. description.

In the production of 2120 coloring-matters on cotton or other textilefibers made by com bining diazo compounds with the naphthols in thepresence of the fiber. the diazo compound employed has been used just asit is produced by the action of nitrous acid on amidated compounds andthe color developed by means of an alkali.

This invention consists in the further treatment of the diazo bath byneutralizing the acid in the solution before employing the same fordyeing or printing, and for this purpose I pre fer to use the carbonatesof the metals of the alkaline earths.

As an example of the manner in which the invention can be carried intoefiect, I employ a diazo bath made in the usual manuersny by treating anmnido compound with muriatic acid and nit-rite oi sodaand after thereaction is complete I add to it, say, carbonate of lime till the acidis neutralized, which can be ascerthen he filtered and employed for thepurpose of producing azo colors on the fiber, and if the fiber has beenpreviously oiled and passed through a warm solution of nnphthol in themanner described in my patent No. 252,317, the color will be at oncedeveloped without further treatment with alkali.

Having thus fully described my invention and the manner of carrying thesome into effect, what I claim as my invention, and desire to secure byLetters Patent, is

The direct production of nzo colors upon cotton or other textile fabricsby the action of a neutralized bath of the diuzo compounds upon fiberpreviously treated with the naphthols 0r phenols, thereby immediatelyproducing the color in the both without subsequent treatment,substantially as described;

In witness that I claim the foregoing I have hereunto set my hand.

THOMAS HOLLIDAY. Witnesses:

A. B. (JRossLEY,

Patent Agent. (1. W. WHITMAN,

U. S. Consular Agent.

